Question about smoothing issues to the model
You need to do 3 things to get a clean shading:

You have sharp edges, so, in Edit mode, CtrlE &gt; Clear Sharp
You have overlapping vertices, so, Edit mode, select all and (in 2.79) W &gt; Remove Doubles
As I said, in the Properties panel &gt; Object Data &gt; Geometry &gt; Clear Custom Split Normals Data